Imagine a place where there is no future, only your past; where there are no plans, only what you did. Welcome to death. Death is the place that the five protagonists of this 80 minute drama all unexpectedly find themselves. They also find themselves facing a rather more interesting dilemma than the deceased in Jean-Paul Sartre's Huis Clos, who merely discover that hell is other people.
In 100, those arriving at the great railway terminus in the sky must choose a single memory to live and relive throughout eternity. All other memories will be deleted and anyone who does not feature in the memory will be lost for you forever. Choose the memory that features your lover and it will be as if your sister never existed. And you've got to be speedy about it. Eternity is in one hell of a hurry. You only have until the officious little man in white counts to 100 to have your chosen memory recorded.
This Edinburgh Fringe to London transfer may not be an entirely original idea, but it is a beautifully executed one from newcomers theimaginarybody. Played on an almost bare stage with just a few bamboo sticks as props, its sheer unaffected simplicity is an integral part of its power. That, and the fact that the characters' dilemma is the audience's dilemma too, a point expertly made in the way that the recording mechanism for each memory has a flash that blinds those watching. There is an energy and real connection here between actors and audience, and in that blinding flash an image of the individual and society facing itself.
This is a show that you will carry around with you long after you have left the theatre as you ponder your own memories - the big, intense ones and the tiny, apparently insignificant ones - and make your own desert island choice for eternity.
· Until February 22. Box office: 020-7478 0100.